JPH01224016A - Liquid filtration device - Google Patents

Abstract

PURPOSE:To prevent the filter medium from the deformational tight adhesion to projecting bodies and from changing the pore diameter and to stabilize the filtration capacity by laminating a film type filter medium to a mesh type reinforcing plate of deformational resistance which is laminated to the projecting bodies provided to secure the filtrate flowing-out spaces for the filter medium. CONSTITUTION:The liquid to be filtered is entered a liquid flowing-in space 10 from a liquid flowing-in opening 11 and spreads all over the surface of the film type filter medium 8 to be filtered. The filtrate passed through the film type filter medium 8 and the reinforcing plate 14 stuck to the back surface of the filter medium is flowed out from a filtrate flowing-out opening 13 through a filtrate flowing-out space 12. The substances to be removed in the liquid to be filtered are caught and separated by the film type filter medium 8 from the liquid entered the liquid flowing-in space 10. In this case, the reinforcing plate 14 which is formed in a mesh state or a porous state difficult to be deformed against the pressure of the liquid to be filtered, keeps the plain state against the projecting bodies 4 to maintain the specified filtration capacity because the filtrate flowing-out space 12 keeps its initial space and the pore diameter of the filter medium 8 is not changed.

Description

[Detailed description of the invention] (1) Purpose of the invention <Industrial application field> The present invention relates to a liquid filtration device.

More specifically, the present invention relates to a liquid filtration device using a thin plate-like filter material made of flexible foam or porous material. In addition, in the present invention, tracing is a concept that includes ultrafiltration (B filtration), dialysis, etc. in addition to normal ejection.

<Prior Art> In order to prevent the housing and the filter medium from coming into close contact with each other and impeding the flow of liquid, a filter device having a structure in which rib-shaped or dot-shaped protrusions are provided on the surface of the housing that comes into contact with the filter medium has been known. It is being

Soft material 1 For example, when a sponge-like foam or the like is used as the filter material, the filter material is deformed by the pressure when liquid flows, and the pore diameter set according to the purpose of filtration changes.

Figures 2 and 3 both show enlarged cross-sectional views of the main parts of a conventional liquid filtration device, and show sponge-like foam (
The soft filter material) 1 is formed into rib-like or dot-like protrusions 2a provided on the housing 2 by the pressure of the liquid to be filtered.
It is in a deformed state with a depression in between. In the case of Fig. 2, since the deformation of the foam 1 is small, there is a filtrate outflow space 3 secured by the protrusions 2a, but the pore diameter of the foam 1, which is set according to the purpose of filtration, changes. . Third
In the case shown in the figure, the height of the dots and ribs is low, or the filter medium is highly deformed, so the foam 1 is highly deformed and comes into close contact with the housing 2, and the filtrate outflow space disappears, causing the protrusions to The purpose of installation 2a cannot be achieved.

<Problems to be Solved by the Invention> The present invention has been devised in view of the above-mentioned points, and is designed to prevent the hemorrhoid material from deforming and coming into close contact with the surface having the protrusions provided to ensure the filtrate outflow space. improved, no change in the pore size of the filter medium, and I! ! It is an object of the present invention to provide a liquid filtration device in which a liquid outflow space does not disappear.

(2) Means for Solving the Problems Constructed by the Invention> The object of the present invention is to provide a large number of rib-shaped or dot-shaped protrusions 4.4 on the inner surface.
One of the filtrate flow path forming walls 5b of the housing 6 is provided with opposing liquid discharge flow path forming walls 5a and 5b having mesh-like or porous reinforcement that is difficult to deform due to the pressure of the liquid to be filtered. One side of the plate 14 is positioned, and the membrane filter medium 8 is positioned on the other side of the reinforcing plate 14, so that the reinforcing plate 14 and the membrane filter medium 8 are hermetically housed in the housing 6. A liquid inlet 11 is provided in the housing 6, and a liquid inlet space 10 is secured between the membrane filter medium 8 and the other filtrate flow path forming wall 5a by the protrusions 4.4.
and the one of the liquid discharge flow path forming walls 5b and the reinforcing plate 1.
This is achieved by a liquid filtration device characterized in that a filtrate outflow space 12 secured by the protruding body 4.4 and the fist between the housings 6 and 4 is communicated with a filtrate outflow port 13 provided in the housing 6. be done.

Function> The liquid to be filtered is passed from the liquid inlet 11 to the liquid inlet space 1.
0, spreads over the entire surface of the membrane filter medium 8, and is filtered. The filtrate that has passed through the membrane filter medium 8 and the reinforcing plate 14 passes through the filtrate outflow space 12 and flows out from the filtrate outflow port 13. The substance to be removed in the liquid to be filtered that has passed through the liquid inlet space 10 is captured and separated by the membrane filter medium 8 .

The pressure of the liquid to be saturated is applied to the entire surface of the membrane filter medium 8, but the reinforcing plate 14 receives the back surface of the membrane filter medium 8, and the reinforcing plate 14 is deformed by the pressure of the liquid to be filtered. Since it is formed in a mesh-like or porous shape that is difficult to deform, it maintains a bridge state (maintains a flat state) without deforming with respect to the protruding body 4.4,・φ, and the initial The volume of the liquid outflow space 12 is maintained, while the planar state of the membrane filter medium 8 is compensated, so that the pore size of the membrane filter medium 8 does not change.

Therefore, high and stable filtration performance and filtration flow rate can be obtained.

<Example No. 9/Figure 1> The liquid filtration device of this example is configured as a leukocyte separator, and a dense membrane filter medium 7 made of polyester and a polyvinyl alcohol-based filter are housed in a plastic housing 6. It has a structure in which a membrane-like filter medium 8 made of a porous material and a mesh-like reinforcing plate 14 made of polyester are stacked and housed, and a lid 9 made of transparent plastic is covered.

There are protrusions 4.4 on the wall surface 5a of the housing 6, and a loose membrane filter medium 7 is closely attached to these protrusions 4.4. Therefore, a liquid inflow space 10 is secured between the loose and dense membrane filter medium 7 and the wall surface 5a by the protrusions 4.4 and the fist, and the liquid flows over the entire surface of the membrane filter medium 7.8. ing. On the inner surface 5b of the lid 9, there are protrusions 4.4,
There are fists, and a reinforcing plate 14 is in close contact with these protrusions 4, 4, . Therefore, a liquid outflow space 12 is secured between the reinforcing plate 14 and the wall surface 5b by the protruding body 4.4 and the Φ fist, and the filtrate flows through the membrane filter medium 7.8 and the entire surface of the reinforcing plate 14, and the liquid It flows out into the outflow space 12.

The reinforcing plate 14 is formed in a mesh shape to compensate for the flow of filtrate to the membrane filter medium 8, and prevents the membrane filter medium 8 from being deformed by the inflow pressure of liquid and the filtrate outflow space 12 from disappearing. In this way, the surface of the membrane filter medium 8 on the filtrate outflow side is supported in a flat manner. The inner end of the liquid inlet 11 is connected to the wall surface 5
It extends as a groove to the vicinity of the center of d, ensuring a large inflow passage cross-sectional area. Further, the lower end of the filtrate outflow space 12 and the filtrate outflow port 13 are communicated with each other.

Blood wave test> When one half of concentrated red blood cell fluid derived from a 400 m blood sample was processed using the leukocyte separator shown in Figure 1, filtration was completed in 6 minutes and 34 seconds, and the leukocyte removal rate was 87.8. %, the other half of the concentrated red blood cell fluid was divided into two halves using a conventional white blood cell separator (which has the same filtration area as the one in Figure 1, but does not have the reinforcing plate 14 and has a protruding membrane filter medium 8). When treated with body 4.4, ◆ one with a conventional structure that comes into direct contact with the temple; the membrane filter medium 8 is the same product),
Filtration was completed in 14 minutes and 32 seconds, and the leukocyte removal rate was 88.4.
%Met.

As is clear from this test, the leukocyte separator according to the present invention had good filtration time and leukocyte removal rate.

(3) Effects of the Invention As described above, in the liquid filtration device of the present invention, the tracer has a mesh-like or porous structure that is difficult to deform in the protruding body provided on the housing to ensure a filtrate outflow space. After stacking the reinforcing plates, the membrane filter medium is stacked, so that the reinforcing plate supports the membrane filter medium and prevents the membrane filter medium from deforming and coming into close contact with the surface of the housing where the protrusions are provided. There is no change in the pore size of the cancerous material, and no disappearance of the filtrate outflow space occurs, resulting in high and stable filtration performance and filtration flow rate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the liquid filtration device of the present invention configured as a leukocyte separator. FIG. 2 and FIG. 3 both show enlarged sectional views of essential parts of a conventional liquid filtration device. 4. Letter-like body, 5a, 5b...Filtrate flow path forming wall, 6.e Housing, 7.φ membrane filter medium, 8.. Membrane filter medium, 9.. Lid, 10.. Liquid inflow space, 11 ...Liquid inlet, 12.Filtrate outflow space, 13φ filtrate clarifying outlet, 14.Reinforcement plate,

Claims (1)

[Claims] One of the filtrate flow path forming walls of the housing is provided with opposing filtrate flow path forming walls having a large number of rib-like or dot-like protrusions on the inner surface, and the pressure of the liquid to be filtered is applied to the housing. One side of a mesh-like or porous reinforcing plate that is difficult to deform is positioned, and a membrane filter medium is positioned on the other side of the reinforcement plate, so that the reinforcement plate and the membrane filter medium are placed in the housing. The housing is hermetically housed, and a liquid inflow space secured by the projecting body between the membrane filter medium and the other filtrate flow path forming wall is communicated with a liquid inlet provided in the housing, A liquid filtration device characterized in that a filtrate outflow space secured by the protruding body between the one of the filtrate flow path forming walls and the reinforcing plate is communicated with a filtrate outflow port provided in the housing.